The Mutt occurrence area is underlain by a northerly trending faulted syncline of Helikian Purcell Supergroup sediments consisting of Aldridge Formation argillites and stratigraphically higher Lower Creston Formation micaceous quartzites. The property straddles a major north-northeast fault up the Wild Horse River valley.

Recent stripping has revealed a zone of 0.3-0.6 metre wide ankerite sills injected into graphitic argillites of the Aldridge Formation. These sills have minor sulphidic quartz-carbonate tension fracture veinlets associated with them. Two bulk samples of this material revealed low (particulate) gold values in the sills and veinlets. A gravity concentrate sample assayed up to 4.9 grams per tonne gold (Assessment Report 15912).